Yaaaaaay now I don't need to PM you every time I have an audio question :D.

General suggestions:

1) General grammar/clarity cleanup advised. Stuff like the below made me go "o.O"
Instead, what they mean that they actually sound like in the studio is from their judgement of how a studio sounds like from the actual studio perspective of listening to loudspeaker monitors, which is a very different experience and a very different kind of sound compared to headphones.
2) Clean up/reorganize your types sections. For example, the way the headphone types section is currently written doesn't make it clear that there is a such thing as closed circumaural headphones. You also have 2 subsections called "types" under speakers.

3) You have a ton of recommendations. I'd recommend doing some formatting/subsectioning to make the wall of text easier to visually parse.